17 – The snow in the Wizard of Oz was asbestos.
The other huge hit film to be released in 1939 was the Wizard of Oz, widely considered to be one of the greatest movies in history. The film is famous for its Technicolor, memorable characters, and timeless songs.
In one iconic scene, Dorothy and company are frolicking through a field of poppies when the Wicked Witch casts a spell that causes it to snow and the crew to fall asleep. As it turns out, the substance used as the fake snow for that scene was actually asbestos—the carcinogen and now banned substance.